Engine oil Mobil or Castrol

Castrol Edge 5w40 looks like the best one to get for this car.

5w40 castrol from the factory.

I only had two oil changes and stuck with the OEM Castrol 5w40 :thumbup:

Castro 10- 60 Audi uses it in R8 GT which is NA and not subject to extra thermal loaf of TC. Live in South Florida so cold starts not an issue and Sebring in August is HOT. Also run 50 % VP 103 in summer to cool things a bit and reduce prevent timing loss.

I run the OE Castrol because I still have CPO warranty for another year.

Performed the oil and filter change this morning along with a good inspection of the top and bottom of the motor. Everything looked great, nice and clean.

According to [these measurements](https://540ratblog.wordpress.com/), Mobil 1 advanced full synthetic (basic Mobil 1) has a film strength of 117,799 psi whereas Pennzoil Platinum's fim strength is only 99,949 psi.

So then **Mobil 1 is better**.

Honestly, as long as you're changing your oil regularly and not putting Autozone branded oil in, it doesn't matter that much. I like Mobile 1 for NA cars.

I did an oil change last week at 5800 miles and used Mobil1 0W40 VW spec .

Castrol is notorious for getting dirty very fast (detergents is the popular explanation). Why I like Mobil 1 a lot, doesn't discolor nearly as fast and still a very good synthetic oil.